Drilling stabilizer
AssigneesJapanese National Oil Corporation, Japan Research and Development Center for Metals
InventorsAkihiko Ikegaya, Keiichi Tsuda
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Abstract
A high-performance drilling stabilizer is provided that is high in both wear resistance and strength. Blades are bonded to a stabilizer body. The blade is split into at least two segments. The blade segments are bonded to the stabilizer body to form the blade. A laminate made of cemented carbide and having a laminate structure made up of at least two layers is bonded to the top of each of the blade segments. The laminate has a thickness of between 1 mm and 5 mm. The cobalt contents of the respective layers decrease stepwise from the innermost layer toward the outermost layer.
Claims6
A drilling stabilizer comprising a stabilizer body and a blade provided on said stabilizer body, said blade being split into at least two segments, said segments being bonded to said stabilizer body to form said blade, wherein a laminate made of cemented carbide and having a laminate structure comprising at least two layers is bonded to each of said blade segments, said laminate having a thickness of 1 to 5 mm, the cemented carbides of the respective layers of said laminate having cobalt content decreasing stepwise from an innermost layer to be bonded to said blade toward an outermost layer.
Dependencies are inferred from the claim text.